I just got the 5 last week. Charged it, turned it on, put in wifi, and there was the notice about downloading 4.5.10.
Got it, and proceeded to customize the phone to my taste. Almost everything MXPE did, you can do. After waiting for Motorola and security never mind OS updates, this was amazing.
One difference, Oneplus 5 doesn't allow MID for main phone or ringtones. You can have them in address book.